JP2001210510A5 - - Google Patents
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- JP2001210510A5 JP2001210510A5 JP2000024772A JP2000024772A JP2001210510A5 JP 2001210510 A5 JP2001210510 A5 JP 2001210510A5 JP 2000024772 A JP2000024772 A JP 2000024772A JP 2000024772 A JP2000024772 A JP 2000024772A JP 2001210510 A5 JP2001210510 A5 JP 2001210510A5
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- magnetic powder
- soft magnetic
- magnetic
- powder
- surface area
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Description
【００１２】
広い周波数範囲の不要輻射に対応するために、必要な大きさの異方性磁界（Ｈｋ）を広い周波数範囲で与える軟磁性粉末を得るには、複数の互いに異なる大きさの異方性磁界（Ｈｋ）を有する複数の磁性粉末を混合する方法があるが、本発明者らは、より簡便に即ち単一種の組成を有する粉末にて２つの互いに異なる大きさの異方性磁界（Ｈｋ）を有する磁性粉末を得る方法を見出し本発明をなすに到った。[0012]
In order to obtain a soft magnetic powder that provides an anisotropic magnetic field (Hk) of the required magnitude over a wide frequency range in order to cope with unwanted radiation over a wide frequency range, it is necessary to obtain a plurality of anisotropic magnetic fields of different sizes. Although there is a method of mixing a plurality of magnetic powders having Hk), the present inventors more simply generate two differently sized anisotropic magnetic fields (Hk) in a powder having a single composition. A method for obtaining a magnetic powder having a magnetic powder has been found, and the present invention has been made.
【００１３】
本発明によれば、組成が単一で、最大値を持ちかつ極大値及び極小値を持たない粒度分布曲線を有し、互いに異なる大きさの２つの異方性磁界を有し、比表面積が０．３ｍ ２ ／ｇ以上であることを特徴とする軟磁性粉末が得られる。0013
According to the present invention, the composition is single, has a particle size distribution curve having a maximum value and no maximum value and no minimum value, has two anisotropic magnetic fields of different sizes, and has a specific surface area. A soft magnetic powder characterized by having a thickness of 0.3 m 2 / g or more can be obtained.
【００２５】
この表面磁気異方性に起因すると考えられる２つ磁気共鳴発現については、粉末単位重量あたりの表面積、即ち比表面積の大きさが支配的な要因であるが、表面磁気異方性をもたらす他の要因、例えば磁気弾性効果の大きさ、即ち磁歪定数の大きさや、粉末に残留する歪の大きさによっても２つの共鳴が発現する表面積が異なってくるので、その値を特定して示すのは困難である。0025.
The surface area per unit weight of the powder, that is, the size of the specific surface area, is the dominant factor for the two magnetic resonances that are considered to be caused by this surface magnetic anisotropy, but other factors that cause surface magnetic anisotropy. It is difficult to specify and show the value because the surface area where the two resonances occur differs depending on the factor, for example, the magnitude of the magnetic elastic effect, that is, the magnitude of the magnetostrictive constant and the magnitude of the strain remaining in the powder. Is.
【００２６】
しかしながら、粉末が大きな磁気弾性効果による異方性を有するほど、２つの磁気共鳴が現れる表面積は小さくなる傾向が認められている。従って、機械的に摩砕され扁平化された粉末では、摩砕による残留応力がかなり大きいと考えられるので、比較的小さな表面積で２つの共鳴が認められる場合が多い。0026
However, it has been found that the surface area where the two magnetic resonances appear tends to be smaller as the powder has anisotropy due to the greater magnetic elasticity effect. Therefore, in the mechanically ground and flattened powder, it is considered that the residual stress due to the grinding is considerably large, so that two resonances are often observed in a relatively small surface area.
【００４６】
（実施例３）
実施例１及び実施例２は、扁平形状の磁性粉末を用いた場合についての説明であるが、前記の通り、２つの磁気共鳴が発現する現象は、表面磁気異方性によるものであると考えられるため、粉末形状が扁平形状でなくとも同様の現象を発現する。その例を次に示す。磁性粉末として、磁歪定数が０でない不定形の形状を有し、粒度分布が単一分散を示すマグネタイト（Ｆｅ３Ｏ４）粉末を準備した。この場合も比表面積が０．２０ｍ２／ｇ、１．３ｍ２／ｇの磁性粉末を用い、実施例１と同様に作製した複合磁性体からなる試料を、それぞれ試料７、試料８とする。[0046]
(Example 3)
Examples 1 and 2 are described in the case of using a flat magnetic powder, but as described above, it is considered that the phenomenon of two magnetic resonances is due to surface magnetic anisotropy. Therefore, the same phenomenon occurs even if the powder shape is not flat. An example is shown below. As the magnetic powder, a magnetite (Fe 3 O 4 ) powder having an amorphous shape with a non- zero magnetostrictive constant and a particle size distribution showing a single dispersion was prepared. In this case as well, the magnetic powders having a specific surface area of 0.20 m 2 / g and 1.3 m 2 / g are used, and the samples made of the composite magnetic material prepared in the same manner as in Example 1 are referred to as Sample 7 and Sample 8, respectively.
Claims (5)
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000024772A JP2001210510A (en) | 2000-01-28 | 2000-01-28 | Soft magnetic powder and composite magnetic unit using the same |
| CN01800122A CN1363100A (en) | 2000-01-28 | 2001-01-24 | Soft magnetic powder and composite magnetic material using same |
| EP01901524A EP1166289A1 (en) | 2000-01-28 | 2001-01-24 | Soft magnetic powder and composite magnetic material using the same |
| PCT/JP2001/000438 WO2001056043A1 (en) | 2000-01-28 | 2001-01-24 | Soft magnetic powder and composite magnetic material using the same |
| KR1020017011867A KR20020034989A (en) | 2000-01-28 | 2001-01-24 | Soft magnetic powder and composite magnetic material using the same |
| NO20014745A NO20014745D0 (en) | 2000-01-28 | 2001-09-28 | Soft magnetic powder and composite magnetic material using this |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000024772A JP2001210510A (en) | 2000-01-28 | 2000-01-28 | Soft magnetic powder and composite magnetic unit using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001210510A JP2001210510A (en) | 2001-08-03 |
| JP2001210510A5 true JP2001210510A5 (en) | 2004-08-26 |
Family
ID=18550712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000024772A Pending JP2001210510A (en) | 2000-01-28 | 2000-01-28 | Soft magnetic powder and composite magnetic unit using the same |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1166289A1 (en) |
| JP (1) | JP2001210510A (en) |
| KR (1) | KR20020034989A (en) |
| CN (1) | CN1363100A (en) |
| NO (1) | NO20014745D0 (en) |
| WO (1) | WO2001056043A1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3864773B2 (en) * | 2001-12-10 | 2007-01-10 | 三菱マテリアル株式会社 | Mixed powder for radio wave absorber and radio wave absorber exhibiting excellent radio wave absorption characteristics for high frequencies in a wide frequency band |
| US20040041121A1 (en) * | 2002-08-30 | 2004-03-04 | Shigeyoshi Yoshida | Magnetic loss material and method of producing the same |
| JP4530140B2 (en) * | 2004-06-28 | 2010-08-25 | Ｔｄｋ株式会社 | Soft magnetic material and antenna device using the same |
| KR100571119B1 (en) * | 2005-01-11 | 2006-04-13 | 공주대학교 산학협력단 | Soft magnetic nano-particles coated with ferrites and making process thereof, soft magnetic core using the same |
| CN101142044B (en) * | 2005-01-25 | 2010-12-01 | 大冶美有限公司 | Iron powder coated with mg-containing oxide film |
| DE102005022473B4 (en) * | 2005-05-14 | 2007-05-24 | Forschungszentrum Karlsruhe Gmbh | Device for damping reflections of electromagnetic waves, process for their preparation and their use |
| JP2006339528A (en) * | 2005-06-03 | 2006-12-14 | Polymatech Co Ltd | Radio wave absorber and its manufacturing method |
| CN101268205A (en) * | 2005-09-16 | 2008-09-17 | H.C.施塔克有限公司 | Reduction method |
| JP5453036B2 (en) * | 2009-10-06 | 2014-03-26 | Ｎｅｃトーキン株式会社 | Composite magnetic material |
| JPWO2014098065A1 (en) * | 2012-12-19 | 2017-01-12 | 戸田工業株式会社 | Electromagnetic interference suppressor |
| JP6280157B2 (en) * | 2016-05-17 | 2018-02-14 | 株式会社リケン | Near-field noise suppression sheet |
| CN105985583A (en) * | 2016-06-02 | 2016-10-05 | 横店集团东磁股份有限公司 | Preparation method of rubber-plastic soft-magnetism antifreeze plate for wireless charging |
| CN112980199B (en) * | 2021-04-19 | 2022-06-03 | 闽都创新实验室 | Organosilicon composite magnetic material for shielding low-frequency alternating magnetic field and preparation method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0993034A (en) * | 1995-09-22 | 1997-04-04 | Tokin Corp | Compound magnetic substance, manufacture of the same and electromagnetic interference suppresser |
| JP3404618B2 (en) * | 1996-09-02 | 2003-05-12 | エヌイーシートーキン株式会社 | Electromagnetic interference suppressor |
-
2000
- 2000-01-28 JP JP2000024772A patent/JP2001210510A/en active Pending
-
2001
- 2001-01-24 KR KR1020017011867A patent/KR20020034989A/en not_active Application Discontinuation
- 2001-01-24 CN CN01800122A patent/CN1363100A/en active Pending
- 2001-01-24 EP EP01901524A patent/EP1166289A1/en not_active Ceased
- 2001-01-24 WO PCT/JP2001/000438 patent/WO2001056043A1/en not_active Application Discontinuation
- 2001-09-28 NO NO20014745A patent/NO20014745D0/en not_active Application Discontinuation
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